What is the Cause of Biotrickling Filters Blockage?

Published on by in Technology

We are using biotrickling filters to remove hydrogen sulphide gas (H2S) from waste water. 

The differential pressure inside the cylinders indicates that the media inside is blocked. The problem remained even after flushing. 

What could be the reason for the blocked cylinders? How do we solve the blockage and how do we prevent it from happening again?